s=input()
s1=''
for char in s:
    if char=='(':
        s1+=char
    if char==')':
        if len(s1)>0:
            if s1[len(s1)-1]=='(':
                s1=s1[:-1]
    if char=='[':
        s1+=char
    if char==']':
        if len(s1)>0:
            if s1[len(s1)-1]=='[':
                s1=s1[:-1]
    if char=='{':
        s1+=char
    if char=='}':
        if len(s1)>0:
            if s1[len(s1)-1]=='{':
                s1=s1[:-1]
    if char=='<':
        s1+=char
    if char=='>':
        if len(s1)>0:
            if s1[len(s1)-1]=='<':
                s1=s1[:-1]
if len (s1)==0:
    print('+')
else:
    print('-')